质量为m的木块和质量为M（M＞m）的铁块用细线连接刚好能在水中某个位置悬浮静止不动，此时木块至水面距离为h，铁块至水底的距离为H（两物体均可视为质点）．突然细线断裂，忽略两物体运动中受到水的阻力，只考

题干

质量为m的木块和质量为M（M＞m）的铁块用细线连接刚好能在水中某个位置悬浮静止不动，此时木块至水面距离为h，铁块至水底的距离为H（两物体均可视为质点）．突然细线断裂，忽略两物体运动中受到水的阻力，只考虑重力及浮力，若M、m同时分别到达水面水底，以M、m为系统，那么以下说法正确的是（）

A：该过程中系统动量不守恒

B：该过程中M、m均作匀速直线运动

C：同时到达水面水底时，两物体速度大小相等

D：系统满足MH=mh

上一题下一题 0.0难度选择题更新时间:2019-03-24 09:53:15

D

Bike Rentals (租赁)

Welcome to Arcadian Shop. We offer different kinds of bikes that can be rented.

Places	Place 1: Zoo Station We are directly at the Zoo train station, facing the parking area. You'll find us just past the main entrances(人口) opposite the Zoo entrance. Place 2: Alexanderplatz We're right under the TV tower. If you're facing the entrance of the Tower, walk to your right around the corner.
Open Hours	9 : 30—18 : 00
Rental Prices	1/2 Day	$7
	One Day	$12
	2^relDay	$10
Deliveries	If you live near our shop and you don't have time to rent bikes from our shop in person，we can send one to your home. The delivery fee(传送费用) is $8 for each bike. We also offer some deliveries outside of our normal delivery area. But you need to pay more for the deliveries.
Please call 650-968-3575 for bike rentals.