心脏压塞时查体可有下列哪些体征（）
A.血压下降并脉压变小
B.奇脉
C.心动过速
D.心包摩擦音
E.颈静脉怒张
参考答案：A, B, C, E
25．---Let’s throw a surprise party for mom’s 50th birthday.
---That’s a good idea. We________several of her friends.
A．invite
B．have invited
C．are inviting
D．will invite
当炉膛温度达到（）℃可不点火直接送煤气。
A.400
B.600
C.900
D.1000
