From the passage, we can inter that
A. the author has a high opinion of the foundation
B. the author is surely a close friend of the Gates
C. the author believes Bill Gates is really a kind person
D. the author admires the medical knowledge of Bill Gates
第1题:
A. must have
B. can’t have
C. should have
D. needn’t have
答案:D
解析:根据题意选D。
本句意思:我们应该已经预订过了。看,这家餐厅几乎空无一人。
must have意思为:“必须已经”;can’t have“不能”;should have意思为:“应该已经”;needn’t have意思为:“不必”,
第2题:
以驱动数据CAN总线为例,在显性状态时,CAN-High与CAN-Low数据总线的电压差为多少?
第3题:
传输速率为500Kbit/s的CAN总线,CAN-high的对地平均电压为
A.约 1.5 V
B.2.0-2.4 V
C.2.5-2.8V左右
D.约 3.5 V;
第4题:
27.If we travel by car ,we_________.
A. can't travel fifty or one hundred miles a day
B. can-t stop at a hotel to spend the night
C. can make our own timetable '
D. can travel to a very far place in several minutes
第5题:
汽车防盗控制单元的CAN-LOW和CAN-HIGH全部断路,汽车防盗系统还能正常工作。
第6题:
7、如何根据CAN-信号来识别出CAN-Low线对地短路? ()。
A.CAN-High线继续正常工作
B.CAN-Low线一直接地
C.两个信号的隐性电平明显低于2V
D.CAN-Low线电压恒定且不等于0