什么是整流器中的触发电路？
参考答案：
给可控硅控制极送触发信号的电路叫触发电路。触发电路应保护迅速，准确，可靠地送出脉冲信号。
—Would you mind answering some questions on shopping habits?
—_______.
A．Yes, with great pleasure
B．No, I am afraid I can't make it
C．Yes, it is worth the time
D．No, as long as it doesn't take long
人出生后在正常情况下，唯一产生血细胞的场所是
A．淋巴结B．肝脏C．脾脏D．胸腺E．骨髓
