黄芪的主要化学成分是( ) A．皂苷及多糖类成分 B．挥发油及皂

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问题单项选择题

黄芪的主要化学成分是( )

A．皂苷及多糖类成分
B．挥发油及皂苷
C．生物碱类成分
D．蒽醌类成分
E．挥发油、生物碱及内酯类成分

答案

参考答案：A

解析：[知识点] 根及根茎类中药——黄芪

阅读理解

阅读理解。

Lucy shows the weights of her classmates. She draws a chart to show the different weights in her

class.

1.What is the weight of most of the students?

A.55kg.

B.50kg.

C.10kg.

2. How many students only weigh 30 kg?

A. Three students.

B. Thirty students.

C. We can't get the answer.

3. How many students weigh 80 kg?

A. One.

B. None.

C. We don't know.

4.Which of the following is not true?

A.4 students weigh 40 kg.

B. Only one student weighs 70 kg.

C. Most students weigh 55 kg.

5. How many girl students are there in Lucy's class?

A.38.

B.40.

C.We don't know.

单项选择题

机上液压驱动的马达可以向系统供电，下列说法正确的是（）

A、ABEX向TRU提供115VAC/3相/5KVA电源。

B、ABEX向E-inverter提供28VDC/50AMPS电源。

C、ABEX向TRU提供115VAC/3相/5KVA电源,且ABEX向E-inverter提供28VDC/50AMPS电源。

D、ABEX向TRU提供28VDC/50AMPS电源,且ABEX向E-inverter提供115VAC/3相/5KVA电源。