用天平称量1mg,比重瓶容积500mL作业,比重瓶置换法所需最小沙量为{}g()
A. 1.0
B. 2.0
C. 5.0
D. 10.0
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Ms. Arroya says that when workshop ----- begins to slow down, it may be time to hire more workers.()
A. product
B. producer
C. produce
D. productivity
Support structure under the Main St Bridge has corroded ----- faster than the bridge ’s designer had predicted.()
A. a lot
B. so too
C. very
D. real
The advertisement for the security guard position says that applicants must be able to remain ----- for six hours straight.()
A. alert
B. observable
C. discovered
D. obvious
月经初潮后女性的一级预防保健重点是()
A. 避孕指导
B. 经期卫生指导
C. 经期卫生指导
D. 孕前优生指导
E. 月经病治疗指导