由于水质的变化往往引起水的温度、密度及______等物理性质的变化，进而导致水体反射

一质点沿x轴运动，加速度与速度方向相同，在加速度数值逐渐减小至零的过程中，关于质点的运动，下列判断正确的是

A．速度始终减小

B．速度先增大后减小

C．速度始终增大

D．速度先减小后增大

短文改错（本题有10小题，每小题1分，共10分）

Dear Mum and Dad,

I expect you are surprised at hearing from me so soon.

The fact is I can’t come home this Saturday                           76.          

as I plan. I have had an accident and hurt my                           77.          

back, and it is not serious. What happened was                         78.          

this. I was riding in the street with Mike when                          79.         

I felt down and lay on my back. I thought it a                          .80         

great joke at the first. But when I tried to stand up,                   81.         

I felt a pain on my back and could hardly move.                       82.         

Don’t worry about me. Mike and his family is               83.         

so kind to me. I will better soon and there is no need                   85.         

for you to come there. I will write to you again soon.                 85.        

肝浊音界消失可见于（）

A.右侧气胸

B.胃肠胀气

C.胃肠穿孔

D.胃、十二指肠溃疡

E.右肺不张

Teflon（PFA）线被认可的工作温度是（）.

A.150℃

B.250℃

C.200℃

D.125℃

随着精确制导武器的大量投入使用，空袭与反空袭成为高科技战争的主要作战样式。