影响重轨精度的主要因数有（）。
A.制造精度
B.工艺基准
C.基本尺寸
D.尺寸公差
参考答案：A
_______ that it was already the fourth time that he _______ abroad.
A．So lucky he was; traveled
B．So lucky was he; traveled
C．So lucky he was; had traveled
D．So lucky was he; had traveled
痰饮流注于经络，则可见（）
A.肢体麻木
B.恶心呕吐
C.胸闷心痛
D.胸闷气喘
E.胸胁胀满
