汽轮机在有些情况下，可不暖机，直接过临界区。
参考答案：对
My parents don’t mind what job I do __ .I am happy.
A．even through
B．as soon as
C．as long as
D．as though
如图所示的四种现象中，属于减小压强的是 [ ]
A.
B.
C.
D.
