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在检查全团成员的证件、签证、及机票时,应着重对____进行检查。 a、有效期 b、签发日期 c、姓名 d、护照

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在游览过程中领队的主要作用是组织协调,因而,领队的站位应该始终是在 ____ a、团队的最前 b、团队的中间 c、团队的最后 d、团队间前后穿梭

旅游团在过边检时,领队应始终走在____ a、团队的最前 b、团队的中间 c、团队的最后 d、团队间前后穿梭

Use what you have learned to write an introduction for the following topic Topic:The Benefits of Exercises Requirements: The paragraph should have three parts, hook, background and thesis. The information should be arranged from general to specific. The hook should be interesting and attractive. The background should be related to the topic and helpful for the readers. The thesis should include three parts, topic, opinion and points. The thesis should be specific, concise, powerful and disputable.

钝化理论最成熟的有:()

A. 吸附理论
B. 成相膜理论
C. 线性极化理论
D. 电偶腐蚀原理