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【单选题】
4型罗经，在纬度20°处启动时到稳定指北需3小时。若启动状态不变，在纬度50°处达到稳定指北的时间（）。A.
大于3小时
B.
小于3小时
C.
仍为3小时
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举一反三
【单选题】下面关于组合逻辑控制器正确的描述是:___。
A.
组合逻辑控制器是由软件实现的，所以比较灵活
B.
组合逻辑控制器是由硬件实现的，因此速度很快
C.
组合逻辑控制器是由软件实现的，所以容易修改
D.
组合逻辑控制器是一系列微指令实现的，因此体积很小
【简答题】Bill, Frank and Dave were three brothers. Every year they sent their mother expensive gifts on her birthday,. They liked to show her how rich they were. The eldest brother. Bill, had a lot of money an...
【简答题】Gifts tighten personal relationships and provide a means of communication between loved ones. People say that a gift lets the recipient（接受者） know we are thinking of them, and that we want to make the ...
【单选题】The gifts he brought from Britain()last week.
A.
sent out(送出)
B.
were sent out
C.
have sent out
【判断题】Gifts sent between close friends are usually practical or something needed.
A.
正确
B.
错误
【简答题】Gifts tighten personal relationships and provide a means of communication between loved ones. People say that a gift lets the recipient（接受者） know we are thinking of them, and that we want to make the ...
【简答题】Bill ,Frank and Dave were brothers. Every year, they sent their mother expensive gifts on her birthday .They liked to show her how rich and successful they were. The eldest brother ,Bill, had a lot of...
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【单选题】The gifts he brought from Britain()last week.
A.
sent out(送出)
B.
were sent out
C.
have sent out
参考解析：
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