在△ABC中,角A,B,C,所对的边分别为a,b,c.若acosA=bsinB,

题型:选择题

问题:

在△ABC中,角A,B,C,所对的边分别为a,b,c.若acosA=bsinB,则sinAcosA+cos2B=(  )
A.-
1
2
B.
1
2
C.-1D.1
考点:正弦定理余弦定理
题型:选择题

Your home is a safe place, right? Think again.

Many serious accidents happen in people's homes. Could you please prevent these accidents? Yes. Many accidents happen because people are careless. So be careful! Here are some tips about safety.

·Don't stand on chairs. Many people may fall off chairs and hurt themselves.

·Keep the floor dry, and you won't slip (滑) or fall.

·Be away from matches. Even a cigarette (香烟) can easily start a fire. Don't use water to put out fires. Use salt instead.

·Be careful with knives! Many people cut themselves in the kitchen. Never touch the broken bottles, doors  or windows. Glass can also cause the most serious cuts.

·Don't keep poisons (毒药) in the kitchen.

·Never use electrical appliances (电器设备) in the shower. Dry the floor before you use them, or  electricity can hurt you!

·Keep children away from hot water and hot drinks. They can be dangerous. But adults often forget it.

·Look through the peephole (门镜) when you hear the knock on the door. Don't let strangers in.

In a word, we should learn to protect ourselves and stay away from danger.

根据短文内容判断正(T)误(F).

小题1:You must be careful when there is water on the floor.

小题2:Salt can’t be used for putting out fires.

小题3:It’ s not safe for people to touch switches(电器)

小题4:Water and drinks can be dangerous for both children and adults.

小题5:Open the door at once when you hear someone knocking at the door.

题型:选择题

人民警察在执法中遭到不明真相的群众和别有用心的人的谩骂、殴打,是公安工作( )的体现。

A.复杂性
B.艰苦性
C.危险性
D.易腐蚀性

题型:选择题

产后会阴出现水肿的产妇需要进行()

A.会阴擦洗

B. * * 灌洗

C. * * 上药

D.会阴湿热敷

E.坐浴

题型:选择题

年轻女性,宫内妊娠14周,B超示:宫内单活胎,相当于孕14周,于子宫左侧可见一大小约14cm×10cm×9cm的肿物,其内可见液性暗区,于今日上午突然出现左侧腹部疼痛,伴恶心,无 * * 出血就诊,妇科检查:左侧腹肌紧张,左侧腹部压痛明显

手术中左侧卵巢肿瘤扭转360°,包膜完整,应做的术式

A.将肿瘤回复正常位置,行肿瘤剥除术

B.在肿瘤蒂根下方钳夹瘤蒂,将肿瘤和扭转瘤蒂一并切除

C.在肿瘤蒂上方钳夹肿瘤,切除肿瘤

D.不动肿瘤,将肿瘤剥除

E.将肿瘤刺破,吸净囊液后放回腹腔

题型:选择题

(3)阐述实施科教兴国战略的重大意义。

更多题库