( )in logistics refers to the differences in the value of the same goods at different time.

A:Warehousing B:Space C:Storage D:Time value

汉语拼音hen（恨）代表的是（）

A:开音节 B:闭音节 C:只有起音和领音的音节 D:没有音谷的音节

The idea that people might be chosen or rejected for jobs on the basis of their genes disturbs many. Such (1) may, however, be a step (2) , thanks to work just published in Current Biology by Derk-Jan Dijk and his colleagues at the University of Surrey, in England. Dr. Dijk studies the biology of time-keeping—in particular of the part of the internal body-clock that (3) people to sleep and wakes them up. One of the genes involved in (4) this clock is known as PER3 and (5) in two forms. Dr. Dijk’s work (6) that one of these forms is more conducive to night-shift work than the other.
The two forms of PER3 (7) into two slightly different proteins, one of which is longer than the other. (8) work by this group showed that people with two short versions of the gene are more likely to be "owls", (9) to get up late and go to bed late. "Larks"— (10) , early risers, have two long versions. Pursuing this (11) of enquiry, Dr. Dijk and his team have been studying how such people (12) to sleep deprivation. Two dozen volunteers, some genetic owls and some genetic larks, were forced to stay awake for two days. The genetic larks reacted to this worse than the owls did. (13) , larks given memory tests and puzzles to (14) between the hours of four and eight in the morning turned (15) far worse performances than did owls.
What (16) that may have for employers is not fully clear. Nevertheless, it is intriguing. There may (17) come a time when employers (18) night shifts will want a blood sample from (19) employees— (20) to protect themselves against negligence suits should someone have an accident.

A:helps B:allows C:causes D:sends

将文件夹下GUN/TAR文件夹中的文件FEN.HEN删除。

Date Time是一个Date类型的变量，以下赋值语句中正确的是 ( )

A:DateTime="5/12/03" B:Date Time=September 1， 2003 C:DateTime=#12 :15 :30 AM# D:Date Time＝("8/8/99")

将文件夹下GUN/TAR文件夹中的文件FEN.HEN删除。

It has been ______ since we went out to play ]ast time.

A:some time B:sometime C:sometimes D:some times

It has been （） since we went out to play last time.

A:some time B:sometime C:sometimes D:some times

_________ 或世界时（ unⅣ ersal time，UT ，GMT ）：以平太阳为 参照点得到的时间计量单位。

A:恒星时（ sidereal time） B:视时（ apparent time） C:平时（ mean time） D:区时（ zone time）

The maximum difference between mean time and apparent time is _____．

A:equal to the longitude expressed in time units B:about 1minutes C:the difference between the GHA of mean sun and the first point of Aries D:15°of arc"