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【单选题】
从预防医学角度讲,所有健康人群至少应每年参( )次健康体检。A.
1
B.
2
C.
3.0
D.
4.0
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举一反三
【单选题】Most creative ideas are laughed at when they are first _____. [ ]
A.
put away
B.
put off
C.
put through
D.
put forward
【单选题】______your book, and do this work first. You may read it later.
A.
Put out
B.
Put away
C.
Put up
D.
Put on
【单选题】The theory was attacked when it was first , but gradually it was accepted.
A.
put up
B.
put down
C.
put forward
D.
put away
【单选题】一标准安装的渐开线外啮合标准直齿圆柱齿轮机构。已知传动比i12＝1.5、中心距a＝200mm、模数m＝4mm、α=20°、ha*= 1。试计算该对齿轮的da1、da2
A.
d a 1 ＝ 168mm d a 2 ＝ 248mm
B.
d a 1 ＝ 165mm d a 2 ＝ 250mm
C.
d a 1 ＝ 180mm d a 2 ＝ 280mm
D.
d a 1 ＝ 150mm d a 2 ＝ 240mm
【单选题】一标准安装的渐开线外啮合标准直齿圆柱齿轮机构。已知传动比i12＝1.5、中心距a＝200mm、模数m＝4mm、α=20°、ha*= 1。试计算该对齿轮的df1、df2
A.
d f1 ＝ 150mm d f2 ＝ 230mm
B.
d f1 ＝ 158mm d f2 ＝ 235mm
C.
d f1 ＝ 160mm d f2 ＝ 240mm
D.
d f1 ＝ 155mm d f2 ＝ 235mm
【单选题】your book, and do your work first. You may read it later.
A.
Put out
B.
Put away
C.
Put up
D.
Put on
【单选题】What should the woman do first?
A.
Put in the money.
B.
Put in the soap powder.
C.
Put in the washing.
【单选题】一标准安装的渐开线外啮合标准直齿圆柱齿轮机构。已知传动比i12＝1.5、中心距a＝200mm、模数m＝4mm、α=20°、ha*= 1。试计算该对齿轮的d1¢、d2¢。
A.
d 1 ¢ ＝ 160mm d 2 ¢ ＝ 240mm
B.
d 1 ¢ ＝ 165mm d 2 ¢ ＝ 245mm
C.
d 1 ¢ ＝ 166mm d 2 ¢ ＝ 248mm
D.
d 1 ¢ ＝ 168mm d 2 ¢ ＝ 250mm
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