单项选择题

铸造合金要求有好的流动性和小的偏析倾向，所以它的凝固温度范围越大越好。
A、正确
B、错误

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单项选择题

Go-back-N（回退 N）表示需要再退回来重传已发送过的序号为N的分组。
A、正确
B、错误

单项选择题

“Inferred information” of a listening passage refers to ________
A、The general information that contains the main idea
B、The hidden information that cannot be found directly
C、The detailed information that is described specifically
D、The complicated information that is not easy to understand