干土块稍用力才能压碎，湿土能搓成泥条，但用手一提即断开（）。
A．砂壤土
B．轻壤土
C．中壤土
D．重壤土
参考答案：B
- Shall we fly to Hainan for the winter ?
-_________ It's warmer there .
A Have a good time B That sounds great C You are right D It must be expenive
氢气管道、设备的动火标准是管道内气体含氢小于0.5％。
