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【简答题】
简述WHO对VOC的定义和室内空气质量标准（GB/T18883）对TVOC的定义。
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皮皮学刷刷变学霸
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【单选题】如果一幅图象中有8个图层,现在需要将这8个图层编于一个组内,最好的方法是:( )
A.
建立一个新组,然后将这8个图层逐个拖拉进这个组内
B.
建立一个新组,按住Shift键连选这8个图层,一次性拖入这个组内
C.
将这8个图层链接起来,然后使用菜单“图层>新建>图层组来自链接的”
D.
将这8个图层链接起来,然后使用菜单“图层>新建>图层组”
【单选题】We’ll finish__________the machine next Monday．
A.
to repair
B.
repairing
C.
in repairing
D.
for as to repair
【单选题】difficulties we’ll meet,we must finish the work in time.A．HoweverB．WhateverC．WhicheverD．Wherever
A.
____difficulties we’ll meet,we must finish the work in time. A．However
B.
Whatever
C.
Whichever
D.
Wherever
【单选题】Everything has gone well as expected so far.________, we have no doubt that we'll finish the task on time. [ ]
A.
Otherwise
B.
Besides
C.
Therefore
D.
However
【单选题】We’ll ________ to finish the task whatever difficulty we _________.
A.
succeed; bring out
B.
manage; come across
C.
succeed; come across
D.
manage; bring out
【单选题】We don’t doubt _____ he’ll finish the task in time. [ ]
A.
which
B.
that
C.
if
D.
whether
【单选题】— We are afraid we can't finish the task ________ a month. — Take your time, but next month you'll have a new one. [ ]
A.
within
B.
by
C.
among
D.
after
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