Wristpin bearings are difficult to lubricate because of their oscillating motion and()
A. their free-floating design
B. their relatively small size
C. the reciprocating motion of the piston
D. their position in the lubrication system
(),印度图书馆学家()的著名论著()问世。他明确提出了()。
保险机构的业务宣传资料应当客观、完整和真实,并应当载有保险机构的名称和地址。
A. 正确
B. 错误
申请领取导游证的前提是参加导游人员资格考试并合格,从而取得导游人员资格证书。
A. 正确
B. 错误