汽轮机调速汽门突然关闭,将使汽包水位瞬间()。
A、迅速上升
B、迅速下降
C、不变
D、缓慢下降
参考答案:B
心包摩擦音听诊的特点不包括
A.在心前区最响亮
B.坐位前倾更明显
C.吸气末更明显
D.与心搏一致
E.屏气时仍存在
One of the real services of the historical novel is not that it can be a substitute for history, but tlat it can be a(n) extension.()
A. compliment
B. supplement
C. instrument
D. replacement