循环冷却水系统的化学清洗方法中投加清洗剂方式有（）。
A.开车前清洗
B.停车前清洗剥离
C.不停产
D.自动清洗
参考答案：A, B, C
先天性甲状腺功能减低症的外貌不包括()
A．眼距宽，鼻梁低平
B．面部黏液水肿
C．舌大宽厚
D．小指向内弯曲，只有一条指褶纹
E．躯干长，四肢短
Which vessel is NOT to be regarded as restricted in her ability to maneuver?（）.
A.A vessel transferring provisions while underway
B.A pushing vessel and a vessel being pushed when connected in a composite unit
C.A vessel servicing a navigation mark
D.A vessel launching aircraft
