多项选择题

以下关于皮下注射的叙述，正确的是： A.
A．严格遵循无菌操作原则 B.
B．进针后无回血方可推注药液 C.
C．掌握无痛注射技巧 D.
D．进针不宜过深，以免刺人肌层 E.
E．离开患者时要确保注射部位不出血

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单项选择题

下列有关敏感性分析的说法中，正确的是（）。 A.
敏感性分析主要反映方案的市场风险大小 B.
敏感性分析中，用作图法进行汇总分析，斜率越小的因素敏感性越强 C.
敏感性分析中不需要计算所有不确定因素变化对经济指标的影响 D.
敏感性分析中，先确定不确定性因素，再确定分析指标

单项选择题

What is the logical order of the following paragraph?
There are some differences, however. Whereas you will find more PCs in business offices, you will find more Macs in classrooms. Although Macs are the computers of choice of people who do a lot of art and graphic design in their work, PCs seem to be the choice of people who do a lot of “number crunching”. Finally, there is a difference in the availability of software, vendors, and service for the two computers. In general, there is a lot of PC-compatible software, but relatively little Mac software. Furthermore, for a Mac, you must purchase your machine and get service from Macintosh-authorized dealer, whereas many different computer stores sell and service PCs

A．Inductive method
B．Chronological order
C．Comparison and contrast
D．Logical division of ideas