腹部闭合性损伤诊断的关键在于首先确定有无()
A.腹壁损伤
B.内脏损伤
C.腹痛
D.恶心、呕吐
E.腹膜后血肿
参考答案:B
当m______时,不等式m<-m成立;当x<a<0时,x2______ax(用“>”或“=”或“<”填空)
While writing a letter, _____. [ ]
A. the door bell rang
B. the door bell rings
C. I heard the door bell ring
D. I heard the door bell rings