舵机浮动杆追随机构中储存弹簧张力过大将导致（）。
A．浮动杆损坏
B．舵不转
C．大舵角操舵不能连续进行
D．安全阀开启
参考答案：C
It is in Steven Spielberg' s first film, Jaws, ____ a big white shark attacks swimmers ____ are spending their holidays in a small village by the sea.
A．where; who
B．which; that
C．that; that
D．where; that
有些塑料易吸水，故注射成型前需干燥，有些塑料则不需要，下列一般不需干燥的塑料是（）。
A.PC
B.PMMA
C.PE
D.PA
