客室内部的废气经侧墙，顶板处的间隙进入车顶和，经自然（）装置排出室外。
在Word中编辑英文文档时，要逐词移动光标，以下正确的键盘按键是（）。 TAB键。 CTRL+HOME。 CTRL+左右光标键（逐词移动）。 CTRL+SHIFT+左右光标键（逐词选中）。
A vessel aground may have negative GM since the（）. decrease in KM is equal to the loss of draft。 virtual rise of G is directly proportional to the remaining draft。 lost buoyancy method is used to calculate KM，and KB is reduced。 displacement lost acts at the point where the ship is aground。
In a large, low-speed diesel engine the clearance between the piston crown and cylinder head is found to be excessiveIn order to correct for this, you should（） build up the piston crown by metal spraying。 build up the cylinder head by metal spraying。 insert shims between the crankpin bearing box and the connecting rod foot。 install a thinner head gasket。
薄壁不锈钢管可靠性（）。 高。 低。 不高不低。 牢靠。
薄壁不锈钢管通径（）。
