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【单选题】
In most small companies, why does the manager realize the necessity of the HR function in general?A.
Because he or she is scared by attorneys.
B.
Because he or she has attended a meeting.
C.
Because he or she is the owner or most senior manager.
D.
Because he or she is scared by the complexities of complying with federal and state codes.
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【单选题】It's so noisy. I'd really appreciate ______ if you'd turn the radio down. [ ]
A.
that
B.
it
C.
this
D.
which
【单选题】— I didn't hear you come in last night. — That's good. We tried ______ noisy. [ ]
A.
not be
B.
not to be
C.
to be
D.
to be not
【简答题】矩形波导不能传输（）波，只能传输（）波和（）波。当a>b时，截止频率最低的模式为（）模，相应的截止波长为（）。
【简答题】'a'-32 的运算结果为___。