题目内容

The puncturing point to blocke the cutaneous branches of the cervical plexus is ()

A. The medial point of posterior border of sternocleidomastoid
B. The medial point of anterior border of sternocleidomastoid
C. The medial point of posterior border of sternohyroid muscle
D. The medial point of anterior border of sternohyroid muscle
E. Jugular notch of sternum

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The projection of the inferior line of pleural reflection in the left midclavicular line is at the level of ()

A. the 6th rib
B. the 8th rib
C. the 7th rib
D. the 9th rib
E. the 10th rib

The nerve which controls the muscles of anterior group of the arm is ()

A. ulnar n.
B. radial n.
C. median n.
D. axillary n.
E. musculocutaneous n.

随机振动频域特性的主要统计参数是（）等。

A. 功率谱密度函数
B. 由功率谱密度函数派生出来的频响函数
C. 相干函数
D. 仅A和B

常见的减振措施有（）。

A. 吸振
B. 隔振
C. 阻振
D. 结构修改