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【单选题】
某缓冲溶液的共轭碱K b θ =1.0×10 -6 ,从理论上推算该溶液的缓冲范围pH( )A.
4~7
B.
5~6
C.
6~8
D.
7~9
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举一反三
【单选题】-Could you please __________ when you leave the room? -Sure. But where should I put it? [ ]
A.
make the bed
B.
clean the window
C.
take out the trash
D.
turn off the lights
【单选题】---Excuse me, could you tell me _______________________? --- It will leave at 3:00 p.m.
A.
when will the plane leave for Shanghai
B.
when the plane will leave for Shanghai
C.
how will you go to Shanghai
D.
how you will go to Shanghai
【单选题】在设计直动滚子从动件盘形凸轮机构的实际廓线时,发现压力角超过了许用值,且廓 线出现变尖现象,此时应采取的措施是 。
A.
减小滚子半径
B.
加大基圆半径
C.
减小基圆半径
D.
减小滚子半径;加大基圆半径
【单选题】在设计直动滚子从动件盘形凸轮机构的实际廓线时,发现压力角超过了许用值,且廓线出现变尖现象,此时应采取的措施是 。
A.
减小滚子半径
B.
增大滚子半径
C.
减小基圆半径
D.
增大基圆半径
【单选题】在设计直动滚子从动件盘形凸轮机构的实际廓线时,发现压力角超过了许用值,且廓线出现变尖现象,此时应采取的措施是 。
A.
减小滚子半径
B.
加大基圆半径
C.
减小基圆半径
【简答题】终于,总算(副)( )
【单选题】So you have to leave. How nice it ________ if you ________a bit longer! [ ]
A.
would be; could stay
B.
is; can stay
C.
should be; stay
D.
was; are able to stay
【单选题】在设计直动滚子从动件盘形凸轮机构的实际廓线时，发现压力角超过了许用值，且廓线出现变尖现象，此时应采取的措施是 。
A.
减小滚子半径
B.
加大基圆半径
C.
减小基圆半径
D.
加大滾子半径
【单选题】---- Could you tell me ___________? ----Sure. The day after tomorrow.
A.
when will you leave for the USA
B.
when Mr. Liu will come
C.
when your father comes
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