单片机引脚封装类型大体上都一样。
A. 对
B. 错
1. At that time, _________ that it had been so hard for them to start a small business.
A. never did they realize
B. never they realized
C. never have they realized
D. never they have realized
2. At first, the bank ________ my request for a small business loan.
A. gave off
B. turned down
C. brought about
D. put on
3. He has helped my buyers to find the prodects _________ are right for them.
A. what
B. who
C. that
D. when
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