问题
单项选择题
施工现场专用的、电源中性点直接接地的220/380V三相四线制用电工程中，必须采用的接地接零保护形式是（）。
A.TN
B.TN-S
C.TN-C
D.TT
答案
参考答案：B
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施工现场专用的、电源中性点直接接地的220/380V三相四线制用电工程中，必须采用的接地接零保护形式是（）。
A.TN
B.TN-S
C.TN-C
D.TT
参考答案：B
| 阅读理解 。 | ||||
| ||||
| 1. Who is the youngest ( 年龄） | ||||
| A. Susan. B. Alex. C. Kate. D. John. | ||||
| 2. Where is Alex from? | ||||
| A. Australia. B. Canada. C. Japan. D. The United States. | ||||
| 3. What does Susan like? | ||||
| A. Reading. B. Playing basketball. C. Watching TV. D. Listening to music. | ||||
| 4. Larryis Kate's_______ | ||||
A. brother | ||||
| 5. What can we know from the table （表格）? | ||||
| A. Susan has a brother and a sister. B. Alex wants a pen pal. C. Kate's email address is koolkdf@cox.nei. D. John doesn't like animals. |