淋菌感染的潜伏期为（）
A.1～14天
B.1个月
C.2个月
D.3个月
E.半年
参考答案：A
根据句意填单词。
1. Women's Day is ______ 8th.
2. April Fool's Day is ______ 1st.
3. ______ 1st is Children's Day.
4. Our National Day is______ 1st.
5. Teachers' Day is ______10th.
当电源频率为额定值时，电压降低对电动机运行的影响：
