压力监测换算方法：①1cmH2O=()kPa②1mmHg=()cmH2O=()mmH

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问题填空题

压力监测换算方法：①1cmH₂O=()kPa②1mmHg=()cmH₂O=()mmH₂O③1mmHg=()kPa

答案

参考答案：0．098；1．36；13．6；0．133

选择题

Black boxes, _____ to record flightdata together with pilots' conversation and noises from theaircraft,

are important for people to find out the cause of an aircrash. [ ]

A. design

B. designing

C. designed

D. were designed

单项选择题

《公羊传》接纳夷狄的标准是（）。

A.国力

B.文化

C.地理

D.种族