不宜使用下法的是（） A.痞块癥瘕 B.瘀血积水 C.停痰留饮 D.燥屎内结 E.寒

下列命题正确的是（　　）

A．命题“若x²+y²=0，则x=y=0”的逆否命题为“若x，y中至少有一个不为0，则x²+y²≠0”

B．设回归直线方程为y=2-2.5x，当变量x增加一个单位时，y平均增加2个单位

C．已知ξ服从正态分布N（0，O^-2），且P（-2≤ξ≤0）=0.4，则P（ξ＞2）=0.2

D．若向量a，b满足a•b＜0，则a与b的夹角为钝角．

材料A-D分别介绍了四本书的内容请根据Tom, Betty, Sophia, Jane的需求帮助他们选出他们想读的书并完成小题。

A. This book will help you understand how to stay well and avoid sickness. You’ll learn some things that you might use at home to avoid catching a cold.

B. This book has useful information about how to prevent common accidents. It’s about safety both indoors and outdoors.

C. This book will tell you something about how to keep healthy by doing exercises. You’ll learn not only the importance of doing exercises, but also the ways of doing exercises.

D. Do you have difficulties to communicate with others? Do you often say something wrong when you talk to others? This book will teach you how to say proper things to people.

小题1:Tom is collecting information about how to prevent electrical fire.

小题2:Betty is trying to advise her mother to do some sports.

小题3:Sophia wants to know some ways to avoid common cold.

小题4:Jane is studying talking strategies.

小题5:Kate wants to keep thinner and healthier. Maybe she can borrow the book from ______.

A．Tom

B．Betty

C．Sophia

D．Jane

“I have to go,” she said, and with ______ she hung up the phone.

A．it

B．that

C．which

D．what

传输设备所有同步源丢失上报（）告警。

A、LTI

B、PS

C、R-LOS

D、TA-LOS

预防过敏性哮喘发作的平喘药是

A．沙丁胺醇
B．特布他林
C．色甘酸钠
D．氨茶碱
E．异丙肾上腺素