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【单选题】
振动可以按照频率进行划分,其中低频和中频振动的频率范围分别是( )A.
<50Hz, 50~ 200Hz
B.
<50Hz, 50~ 100Hz
C.
<30Hz, 30~100Hz
D.
<30Hz，30~ 200Hz
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举一反三
【单选题】What she suggested at the meeting was that we ______ cancel the original plan.
A.
should
B.
could
C.
would
D.
must
【简答题】She suggested at the meeting that we ______ cancel the original plan. A) should B) could C) would D) must
【单选题】失血性休克早期引起的缺氧其血氧变化特点为
A.
动脉血氧含量降低
B.
静脉血氧含量升高
C.
动-静脉血氧含量差减小
D.
动-静脉血氧含量差增大
E.
静脉血氧分压升高
【单选题】Many students will take part in the school sports meeting this week, so she suggested that the class meeting ______ held on Saturday. [ ]
A.
not be
B.
not to be
C.
be not
D.
be not to
【单选题】She suggested______ another day in the countryside.
A.
our spending
B.
for spending
C.
to spend
D.
spending
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