船底望光的主要目的是()。 ①检验水尺;②观测船体纵向变形;③检查测深仪换能器的安装位置。
A. ①②对
B. ②③对
C. ①③对
D. ①②③对
引起严重急性呼吸综合征(SARS)的病原体是()。
A. 肺炎衣原体
B. 军团菌
C. 肺炎支原体
D. 副黏病毒
E. 新型冠状病毒
女性,58岁,绝经8年,消瘦1个月来诊。检查:全腹膨隆,下腹压痛阳性,后穹隆触及沙粒样结节,子宫附件触诊不满意,B超见大量腹腔积液,有附件区包块12cm×10cm×8cm,实性,不规则,包膜不完整,全消化道造影未见异常。如要放腹腔积液,一次性放腹腔积液的量最佳为()。
A. 1000ml左右
B. 2000ml左右
C. 3000ml左右
D. 4000ml左右
E. 一次性放完腹腔积液
After an engine is started you should().
A. increase engine speed to insure adequate flow of oil to all parts of the engine
B. pay no attention unless there are unusual noises from the engine
C. check operating pressures and temperatures,and check for leaks
D. run the engine at idle until the temperature has increased