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听力原文: When the early settlers, especially the English, arrived in the New World, the hardships and dangers awaiting them were totally unexpected. Had it not been for some friendly Indians, the colonists never would have survived the terrible winters. They knew nothing about planting crops, hunting animals, building sod houses, or making clothing from animal skins. Life in England had been much simpler, and this new life was not like what the Spanish explorers had reported. The settlers did introduce iron tools, muskets for hunting, domesticated animals, and political ways to the Indians. In exchange, the settlers learned to build canoes for water transportation and snowshoes and skating devices for winter traveling. The Indians also taught them to blaze trails through the forest, to hunt large animals and trap smaller ones, and to spear fish in the lakes and streams. The natives also introduced to the settlers typical foods such as turkey, corn, squash, beans, and pumpkin. Everything possible was done in order to make their new settlement resemble the homes they had left behind. (18)
A.
New political ways.
B.
New methods of fishing.
C.
New means of water travel.
D.
How to trap animals.
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【简答题】请简述计算机网络的传输介质有哪些,至少例举处五个常用的传输介质?
【单选题】属于形状公差的是 。
A.
圆柱度;
B.
平行度;
C.
同轴度
D.
圆跳动;
【单选题】某旅行社与旅游者小赵签订境内旅游合同,明确2017 年11 月17 日出发。在2017 年11 月17 日,旅行社告知小赵由于飞机舱位不足不能成行,那么旅行社应当按照旅游费用总额的( )向小赵承担违约金?
A.
0.05
B.
0.1
C.
0.15
D.
0.2
【简答题】某CPU主频8 MHz,设每个机器周期包含4个时钟周期,且该机的平均指令执行速度为1 MIPS。 (1)求该机平均指令周期。 (2)求每个指令周期包含的平均机器周期。 (3)若改用时钟周期为0.01μs的CPU芯片,求平均指令执行速度。
【单选题】雕刻梅花时,梅花雕刻()瓣。
A.
3
B.
5
C.
6
D.
4
【单选题】以下形位公差中属于形状公差的是()
A.
圆柱度
B.
垂直度
C.
同轴度
D.
平行度
【判断题】CPU的主频不代表CPU的速度,但提高CPU的主频对于提高CPU运算速度却是至关重要的。电脑的整体运行速度不仅取决于CPU运算速度,还与其它各分系统的运行情况有关,只有在提高主频的同时,各分系统运行速度和各分系统之间的数据传输速度都能得到提高后,电脑整体的运行速度才能真正得到提高。()
A.
正确
B.
错误
【单选题】在形位公差中,属于形状公差的是:
A.
垂直度
B.
同轴度
C.
圆柱度
D.
对称度
【单选题】我国纺织品出口经香港商人之手转卖到非洲,这种国际贸易形式称为( )。
A.
转口贸易
B.
过境贸易
C.
直接贸易
D.
服务贸易
【单选题】CPU主频300MHZ,倍频为3,则CPU外频为( )
A.
900MHZ
B.
600MHZ
C.
300MHZ
D.
100MHZ
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