并拢四指对仰卧病人上腹部作迅速冲击性按压,能听到“咕噜”声称为()
A.气过水音
B.移动性浊音
C.振水音
D.肠鸣音
E.腹水摇晃音
参考答案:C
大肠菌RNA的亚基有启动子作用,RNA聚合酶由()
A.3个亚基组成
B.5个亚基组成
C.8个亚基组成
D.9个亚基组成
E.6个亚基组成
The tension on an anchor cable increases so that the angle of the catenary to the seabed at the anchor reaches 10°. How will this affect the anchor in sandy soil?()
A.It will have no effect
B.It will increase the holding power
C.It will reduce the holding power
D.It will cause the anchor to snag