黄某，女，28岁，昨起小便频急，涩痛而赤，腰酸，少腹胀，心烦，少寐，舌质红，苔腻，脉

均值为2，方差为2π的正态分布的概率密度函数为________．

根据需要填入适当的介词。

1. This is a photo ________ my family.

2. I don't think he is ________ home ________ this time.

3. We don't have any classes ________ Wednesday afternoon or ________ the weekend.

4. I get to work ________ seven ________ the morning ________ Monday.

5. His birthday is ________ June 8. Mine is ________ September.

能够给我国带来严寒、大风、霜冻等恶劣天气的是[ ]

A．寒潮

B．台风

C．旱灾

D．涝灾

The signal given to commence lowering the lifeboats is（）.

A.3 short blasts of the ship's whistle

B.1 short blast of the ship's whistle

C.3 long blasts of the ship's whistle

D.1 long blast of the ship's whistle

收单业务包括（）等业务环节。

A.商户资质审核

B.交易监测

C.资金结算

D.争议处理