以下哪些属于早期心衰的体征:()
A.舒张期奔马律
B.交替脉
C.颈静脉怒张
D.下肢水肿
E.肺部呼吸音减弱
参考答案:A, B, C
Do Chinese like playing basketball? ?________. [ ]
A. Yes, he does
B. No, they aren't
C. Yes, they do
D. No, they can't
钻具装有止回阀下钻时每下()柱钻杆向钻具内灌满一次钻井液。
A.5~10;
B.10~15;
C.15~20;
D.20~30。