问题
选择题
A large number of engineers _____ to Africa by our government to help the people there every year. [ ]
A. have sent
B. will send
C. are sent
D. will be sent
答案
答案：C
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A large number of engineers _____ to Africa by our government to help the people there every year. [ ]
A. have sent
B. will send
C. are sent
D. will be sent
答案：C
表中列出几种金属的熔点，据此判断以下说法不正确的是（ ）
| 物质名称 | 汞 | 金 | 铜 | 铁 | 钨 | 武德合金 |
| 熔点/℃ | -38.8 | 1064 | 1083 | 1535 | 3410 | 70 |
A．“真金不怕火来炼”
B．武德合金可以焊接金属
C．水银温度计中的水银常温下是液态
D．用钨制成的灯丝不易熔化