按马斯洛的需要层次论,最低层次的需要是()。
A.生理需要
B.安全需要
C.自我实现需要
D.社会需要
参考答案:A
为增加嵌体固位力,采用钉固位者称
A.高嵌体 B.单面嵌体 C.双面嵌体 D.钉嵌体 E.嵌体冠
When crossing the magnetic equator the().
A.Flinders bar should be inverted
B.Heeling magnet should be inverted
C.The quadrantal spheres should be rotated 180°
D.Flinders bar should be moved to the opposite side of the binnacle