题目内容

在如下图所示的食物网中,已知各营养级之间的能量转化效率为10%,若一种生物摄食两种上一营养级的生物时,两种被摄食的生物量相等,则丁每增加10千克生物量,需消耗生产者戊多少千克?()

A. 3250kg
B. 4500kg
C. 4750kg

查看答案
更多问题

Whatindicatesthatatropicalcyclonemaybewithin500to1,000milesofyourposition?()

Apumpingofthebarometerupanddownafewmillibars
B. Asuddenwindshiftfromsouthwesttonorthwestfollowedbysteadilyincreasingwinds
C. Thenormalswellpatternbecomingconfused,withthelengthoftheswellincreasing
D. Anovercastskywithsteadilyincreasingrainfromnimbostratusclouds

Are-heaterinanairconditioningsystemfunctionsto().

A. controlinletairtemperature
B. controlinletairvolume
C. maintainrelativehumidityat15%
D. restoreconditionedairtemperaturetoacomfortablelevel

Whenadeckcargoissecuredwithchainorwirelashingsandgrab(pear)links,whichstatementisFALSE?()

A. Theamountoftake-upislimitedbythelengthoftheturnbuckle
B. Atthegrab(pear)link,theslackendofchainshouldbeledbackandsecuredtothechainabovethelink
C. Thelashingsshouldbeinspectedeachdayandanyslacktakenup
D. Theturnbuckleshouldbesecuredwithastickorlocknuts

企业日常存货的发出方法有()。

A. 先进先出法
B. 加权平均法
C. 移动平均法
D. 个别认定法
E. 后进先出法

答案查题题库