搜题请搜索小程序“爱下问搜题”
问题
判断题
离心式压缩机(型号D8SS)的最大转速为15300RPM。
答案
参考答案：错
补全对话，情景问答
Read and match. 把问句与答语匹配起来。
( ) 1. What is this?
( ) 2. Whose housecoat is this?
( ) 3. What day is it?
( ) 4. How about your new shirt?
( ) 5. What is Jenny wearing on Sunday?
A. It's mine.
B. It's too big.
C. A pair of shorts.
D. It's Sunday.
E. She is wearing a pink dress.
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单项选择题
下列哪项是维持胸内负压的必要条件是（）
A.胸廓畸形
B.肺内压低于大气压
C.呼气肌收缩
D.吸气肌收缩
E.胸膜腔密闭
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