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【单选题】
细菌生长繁殖中需营养物质其中的铵盐、硝酸盐、蛋白胨等属于( )。A.
碳源
B.
氮源
C.
无机盐类
D.
维生素类
E.
生长因素类
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举一反三
【简答题】判断正误,并作出修改。 According to me, she should have resigned earlier. She smiled friendly. He laughed silly. His father died three years before. Every children need love. All the light was out. We are alread...
【单选题】某设备内的温度为 1000 °C , 要求测量误差小于或等于 5 °C , 应选下列哪一支温度计 ? ( )
A.
0 ～ 2500 ℃ 0.2 级
B.
0 ～ 1000 ℃ 0.2 级
C.
0 ～ 1600 ℃ 0.5 级
【单选题】Mary is said _____ in the supermarket for 5 years, but I don't know why she resigned last month. [ ]
A.
to have been working
B.
work
C.
to be working
D.
to have worked
【单选题】—I haven't seen film star Sally for a long time. —She ________ the stage because she gave birth to a baby last year. [ ]
A.
resigned
B.
retired
C.
quitted
D.
abandoned
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