快速切断阀正常操作时,阀应处于()状态。
A、全开
B、全关
C、开1/4
D、开1/2
参考答案:A
包肠溶衣的目的是().
A、避免药物被胃液破坏
B、避免药物被肠液破坏
C、减少药物对胃的刺激
D、增加在肠道中吸收的药物的作用
During many sectors are foundering, the $21 billion videogame-software industry is booming, adding game developers at a rate of 2,500 a year in the United States alone.
A.When
B.Whereas
C.Would
D.While