A. 对 B. 错
A. share your fears and anxieties with your friends. B. participate in more college activities. C. make detailed plans D. keep silence
A. where are you from? B. where do you come from? C. what's your nationality? D. how do you do?
A. 利润=收入-成本 B. 利润对于持续经营来说不可或缺 C. 创造利润可以通过:增加营业额或者降低成本 D. 销售好,利润一定高
A. 仪器误差 B. 方法误差 C. 理论误差 D. 影响误差
A. 仪器误差 B. 方法误差 C. 使用误差 D. 影响误差