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【单选题】
微波传感器测量物体含水量主要利用下述微波的哪一个特点( ) prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>A.
微波波长很短，频率很高
B.
微波的反射作用很强 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
C.
微波的传输特性很好
D.
微波的吸收作用很强
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举一反三
【单选题】Students are not allowed to ______ for the final exam if they have missed one third of the classes.
A.
make
B.
sit
C.
offer
D.
go
【单选题】It can be inferred that______.
A.
people are not allowed to drive after they drink one quarter in the evening
B.
people are still allowed to drive after they drink one quarter in the evening
C.
people are still allowed to drive after they drink out pint at lunch-time
D.
none
【简答题】No one is allowed to take the computers home without (permit) ______.
【单选题】To keep the environment clean, no one _____ smoke here. [ ]
A.
allows to
B.
is allowed to
C.
allowed to
D.
allow to
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