血液的pH约为()
A.7.35~7.45
B.7.10~7.20
C.7.30~7.40
D.7.45~7.55
E.6.90~7.15
参考答案:A
Mr Ascot, headmaster of the school, refused to accept ______of the three suggestions made by the Students’ Union.
A.either
B.neither
C.any
D.none
冷却水温正常时,水温过高报警灯报警开关的双金属片几乎不变形,触点分开,报警灯不亮。()