滚筒式采煤机喷雾流量应与机型相匹配。如果内喷雾装置不能正常喷雾,外喷雾压力不得小于()。无水或喷雾装置损坏对必须停机。
A、4MPa
B、3MPa
C、2MPa
参考答案:C
In my opinion, what matters is not how much a present costs, _____what it means to you. [ ]
A. however
B. nor
C. either
D. but
麦冬和半夏在麦冬汤原方中的比例为()
A.1:1
B.2:1
C.5:1
D.7:1
E.10:1