题目内容

11. Recently, he has lost all his ___________________ at cards.

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12. At least three ________________ witnessed the accident.

Match the following English phrases with their Chinese versions.

单纯开裂电子分配通常有几种方式

A. 均裂
B. 异裂
C. 半异裂
D. 重排开裂
E. 麦氏重排

质谱仪的核心部件是

A. 真空系统
B. 样品导入系统
C. 离子源
D. 质量分析器