隔膜泵以改变（）的行程，来实现它的流量调节。A.隔膜往复次数 B.转子转速 C.塞柱

经皮腔内冠状动脉成形术(PTCA)后，拔除血管导管鞘的正确护理措施是()

A．至少保留24～48小时后方可拔除

B．拔除前应停用肝素至少8～12小时

C．拔除后须局部压迫止血15～20分钟

D．止血后扎压力绷带，沙袋压迫1小时

E．拔除后平卧2小时方可下地活动

Currently 94% of Web users use either Internet Explorer or Firefox, but recently some new (71) have been developed that are beginning to attract attention. The browser Opera is becoming very (72) because of its speed, it is currently the world’s fastest browser, and because it is much smaller (73) existing browsers (it can almost fit on a single diskette). It can also (74) the last Web page you visited, so the next time you surf, you can start where you left off. And like the big two, you can get it for free; the catch is that you have to watch blinking ads in one comer, or pay ＄40 for the ad-free (75) of Opera.

A．readers

B．machines

C．techniques

D．browsers

土地权利证书注销后由国土部门收回并( )。

A．销毁
B．立卷归档
C．作为历史资料
D．重新编册使用

语用信息

梁式机翼的弯矩主要由下列哪个构件承受（）

A.桁条

B.蒙皮

C.翼梁

D.上、下壁板