单项选择题

指挥动作的基本原则是什么？ A.

省、准、美 B.

省、准 C.

省、美 D.

准、美

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对氧枪升降机构和更换装置的要求？

答案： ①应具有合适的升降速度并可以变速。②氧枪应严格沿铅垂线升降，升降平稳，控制灵活，停位准确。③安全可靠。④能快速换枪。

单项选择题

‌Joseph, a student of Columbia University, found that many of his classmates had purchased an iPad tablet from Apple. Several months after the product's launch, realizing that the iPad was widely considered to be useful and that many students in the United States had rated it highly, Joseph also decided to purchase an iPad. Which of the following is the adopter group to which Joseph belongs?‍
‌‍

A．late majority

B．early majority
C．early adopter
D．laggard