测量仪器非强制检定的特点有（ ）。 A．由使用单位依法自主管理 B．自由送检

阅读理解，判断正误。(正确的标T，错误的标F)

     In the front of many American homes you can see a mat (脚垫).This mat is sometimes called

"welcome mat",because many of the mats have the word "welcome" on them.

     Because Americans don't take off their shoes before going into the house,they need a welcome

mat to clean their shoes.If the children don't clean their shoes on the mat,they may be scolded (被责骂)

by their parents.If you go to an American home,please remember to clean your shoes on the mat,or you

may be told to do so."Different countries,different customs(习俗)."

( )1. There are many "welcome mats" in the front of an American home.  

( )2. Every American home has a welcome mat.                            

( )3. When Americans go into the house,they often take off their shoes.  

( )4. It's better to clean your shoes before you go into an American home.

( )5. There are different customs in different countries.                  

确诊为女性生殖器尖锐湿疣，不适宜的治疗是（）。

A.50%三氯醋酸

B.冷冻

C.激光

D.口服红霉素

E.微波

消化性溃疡大出血的特点，下列不正确的是（）

A.一定有黑便

B.一定有呕血

C.多数患者非手术治疗可止血

D.临床表现取决于出血量和速度

E.部分患者并没有溃疡病史

短路电流周期分量有效值，在短路全过程中是个始终不变的值，取决于短路线路的什么？

下列各穴中，常用于保健并具有强壮作用的穴位是（）

A.百会

B.肾俞

C.脾俞

D.足三里

E.气海俞