非接触式密封严密性较好,适用于较高速度。()
参考答案:对
The manager promised to keep me _____ of how our business was going on. [ ]
A. to be informed
B. to informing
C. informed
D. on informing
食管癌的转移方式包括()
A.直接扩散
B.肝脏转移
C.淋巴转移
D.血行转移
E.种植转移