液压缸的低压密封性能测试,高压保持()h,不得出现降压现象。
A、2
B、3
C、4
D、5
参考答案:C
It is reported that many a new house ________ at present in the disaster.
A.are being built
B.were being built
C.was being built
D.is being built
写作文学散文的“清初三大家”是指侯方域、魏禧、(),三人是桐城派的嚆矢,代表了从明末文风向清初文风的转变。