分立元件PAL开关电路,它受控于双稳态触发电路。
参考答案:对
_________ that Tom got inside the room to see what was going on.
A.So strangely did he feel
B.So strangely he felt
C.So strange did he feel
D.So strange he felt
社区卫生服务的重点服务对象是()
A.健康人群
B.高危人群
C.重病人群
D.亚健康人群
E.重点保健人群