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四冲程发动机完成一个工作循环,曲轴旋转,进、排气门开。
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举一反三
【单选题】镉镍电池的负极是什么元素?()
A.
B.
C.
D.
【单选题】He has not yet informed me _____ his plans for holidays.
A.
of
B.
/
C.
with
D.
by
【单选题】螺旋筋柱的核心区混凝土抗压强度高于 Fc 是因为 。
A.
螺旋筋参与受压
B.
螺旋筋使核心区混凝土密实
C.
螺旋筋约束了核心区混凝土的横向变形
D.
螺旋筋使核心区混凝土中不出现内裂缝
【简答题】设质量m=0.50kg的小球挂在倾角θ=30°的光滑斜面上,如图(a)所示。将质量为0.5kg的小球挂在倾角为a=30°的光滑斜面上,如图所示,斜面以一加速度向左做匀加速直线运动,g=10m/s².试求:a=2.0m/s²时,绳中张力大小和小球对斜面的正压力.
【单选题】Although he has been here for half a year, he has not yet______to the climate here.
A.
adopted
B.
admitted
C.
accessed
D.
adapted
【单选题】铬镍电池的负极是什么元素?()
A.
B.
C.
D.
【简答题】设质量m=0.50kg的小球挂在倾角θ=30°的光滑斜面上(图2-6)。
【单选题】He has not yet ______ to the climate.
A.
adopted
B.
adapted
C.
adept
【单选题】He says that he has not yet decided whether _____ one more time.
A.
trying
B.
try
C.
to try
D.
tried
【单选题】— Li Ming looks very weak. — __________. He has not yet recovered from the illness.
A.
So he is
B.
So he does
C.
So is he
D.
So does he
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