以下关于酶活性单位U的说法正确的是() A.在25℃下,每分钟能催化1μmmol/L

题型:单项选择题 A1/A2型题

问题:

以下关于酶活性单位U的说法正确的是()

A.在25℃下,每分钟能催化1μmmol/L底物转变的酶量

B.在37℃下,每分钟能催化1μmmol/L底物转变的酶量

C.在37℃下,每分钟能催化1mmol/L底物转变的酶量

D.在25℃下,每分钟能催化1mmol/L底物转变的酶量

E.在特定条件下,每分钟能催化1μmmol/L底物转变的酶量

考点:临床医学检验技术(士)诊断酶诊断酶题库
题型:单项选择题 A1/A2型题

阅读理解。

      Bill and his friends are going hiking this weekend. He's afraid he's going to be hungry. So he buys a lot

of food and his bag is big and heavy. They start at nine in the morning and they get to the city five hours later.

They're all tired and his friends get on a bus, but Bill can't. His bag sticks (卡住) in the door and he has to

get off. The bus leaves and he doesn't know where he's going to meet them. He walks in the street and when

it's eight in the evening, he goes into a restaurant. He asks for some drinks and soon begins to sleep. When he

wakes up (醒来) in the midnight (半夜), he can't find any people in the restaurant. The door is closed and he

can't go out. He finds a telephone number on a piece of paper and begins to call Mr. Jackson, the owner of

the restaurant. "Hello," says the boy. "When do you open your restaurant, Mr Jackson?" The telephone wakes

the man up and he isn't happy. So he says,  "Don't ask me about that, I won't let you in."

1. Bill's bag is big because _____.

A. there's lots of clothes in it

B. he puts much food in it

C. he likes big bags

D. he takes many books

2. _____, so he gets off the bus.

A. Bill can't carry his bag onto the bus

B. Bill doesn't see his friends

C. Bill doesn't know which bus to get on

D. Bill wants to take another bus

3. Bill goes to sleep soon because _____.

A. he's very hungry

B. he eats too much in the restaurant

C. he doesn't know where to go

D. he's very tired

4. Mr Jackson thinks _____.

A. Bill wants to sleep in his restaurant

B. Bill wants to go into the restaurant

C. Bill leaves his bag in the restaurant

D. Bill wants to go out of the restaurant

题型:单项选择题 A1/A2型题
81
的平方根是(  )
A.±9B.9C.3D.±3
题型:单项选择题 A1/A2型题

A、B两地的实际距离为42km,用比例尺为1:100000画在地图上的距离为______厘米.

题型:单项选择题 A1/A2型题

下列藻类植物中,植物体(营养体)为二倍体的是()。

A.水绵

B.硅藻

C.松藻

D.轮藻

E.鹿角菜

题型:单项选择题 A1/A2型题

在炼焦用煤中,肥煤加热时产生的胶质体最多。

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