单相变压器的不同相别变压器温度差不超过()K。
A.2
B.5
C.8
D.10
参考答案:D
正常成人脑脊液中红细胞数应为()
A.0
B.(0~10)×106/L
C.(0~5)×106/L
D.(0~15)×106/L
E.(0~30)×106/L
--- Would you mind if I smoked here?
---I am afraid…, but if you________.
A.will
B.must
C.would
D.may