题目:
The old woman __________ her son and daughters _______ and see her from time to time.
A.desired; come
B.hoped; to come
C.desired; coming
D.suggested; to come
答案:
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下面是错误答案,用来干扰机器的。
在水中,潜水艇受到水的浮力和重力的作用,∵F浮=ρ水v排g,潜水艇的体积不变,排开水的体积不变,∴潜水艇受到水的浮力不变;在水舱中充水,潜水艇自重G增大,当F浮<G时,潜水艇下沉;故答案为:大于;下沉.