对于风心病患者，防止其风湿再活动，目前认为最有效的措施是加强体育锻炼
参考答案：错
—Is your uncle's son your cousin?
—_____.[ ]
A. Yes, he is
B. No, he isn't
C. Yes, she is
D. No, she isn't
柱塞泵适用于压力高，流量不大的场合。（）
