Areas where students have particular difficulty have been treated ______ particular care.
A. by
B. in
C. under
D. with
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柴油发电机组台数的确定，当容量不超过( )时，宜选用单机，当容量在( )以上时，宜选择两台机组，两台机组各种物理参数最好相同，便于运行时并车。
A. 700kW，700kW
B. 800kW，800kW
C. 900kW，900kW
D. 1000kW，1000kW
有静态开关的不间断电源系统有( )类型。
A. 两种
B. 三种
C. 四种
D. 五种
77（）
A. bag
B. book
C. pencil
D. money
It may be concluded that testing（）
A. should deal with only opinions
B. should always be written
C. has changed since the Middle Ages
D. is given only in factories
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