题目内容

0ncargobooms,preventersare（）.

A. auxiliaryguys
B. extrafairleads
C. steelbands
D. stops

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A. ①②
B. ③④
C. ②③
D. ①④

A. readingthegagepressure
B. weighingtheextinguisher
C. dischargingasmallamountofCO
D. seeingifthesealhasbeenbroken

A. breaksdownwhenwet
B. kinksbedischarged
C. isnotelastic
D. stretches

A. 木本物种丰富度在2900m左右最低
B. 2600m处木本物种比草本物种丰富
C. 木本物种丰富度随海拔高度增加而上升
D. 草本物种丰富度随着海拔升高，先降低后升高