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【单选题】
可再生能源是广泛存在、用之不竭的初级能源。以下不属于可再生能源的是( )。
A.
太阳能、风能、水能
B.
生物质能、地热能、海洋能
C.
煤炭、石油、天然气
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【单选题】我国水准仪按精度分为:DS05、DS1、DS3和 DS10四个等级,其下标数字表示精度等级,如DS3型水准仪的“3”表示( )。
A.
每千米水准测量高差中数偶然中误差为 ± 3mm
B.
水准仪的型号
C.
水准仪的误差值是3mm
D.
仪器的最小读数为3mm
【单选题】It___ Mike and Mary who helped the old man several days ago.
A.
was
B.
are
C.
were
D.
is
【单选题】It ____Mike and Mary who helped the old man .
A.
are
B.
was
C.
were
D.
had been
【单选题】It__Mike and Mary who helped the old woman yesterday
A.
was
B.
are
C.
ere
D.
had been
【单选题】It Mike and Mary who helped the old man a few days ago.
A.
was
B.
are
C.
were
D.
had been
【单选题】工程测量中一般使用DS3型微倾式普通水准仪,其中数字“3”表示该仪器精度为每公里往返测量高差中数的( )中误差为13mm。
A.
偶然
B.
人为
C.
系统
D.
仪器
【单选题】It Mike and Mary who helped the old man several days ago.
A.
was
B.
were
C.
are
D.
had been
【单选题】工程测量中较多使用DS3型微倾式普通水准仪,数字3表示该仪器精度,即每公里往返测量高差中数的偶然中误差为( )。
A.
±3mm
B.
3mm
C.
-3mm
D.
± mm
【简答题】工程测量中较多使用DS3型微倾式普通水准仪,数字3表示该仪器精度,即每公里往返测量高差中数的偶然中误差为( )。
【单选题】It__Mike and Mary who helped the old man several days ago.
A.
was
B.
are
C.
were
D.
had been
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