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【单选题】
关于齿轮传动的缺点,下列说法不正确的是( )。A.
传动效率较低
B.
制造精度要求较高
C.
成本较高
D.
不适用于距离较远的传动
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皮皮学刷刷变学霸
举一反三
【单选题】It can be seen from the last two paragraphs that
A.
you can control your own body clock.
B.
it is not difficult to adjust to a new time zone.
C.
adjusting your watch can help you avoid jet lag.
D.
there isn't much you can do to avoid jet lag.
【简答题】相见时难别亦难, 。春蚕到死丝方尽, 。
【单选题】By using your eyes you can tell the direction _____ light comes.
A.
in which
B.
from which
C.
with which
D.
on which