题目内容

两种不同的金属都可以进行直接焊接。()

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金属材料常用的力学性能指标主要有强度、塑性、耐腐蚀性、密度、冲击韧度和硬度等。()

The prefix "ex-" as in "ex-wife" or "ex-president" was borrowed into English from

A. Latin.
B. Greek.
C. French.
D. Celtic.

铝及铝合金焊接时容易产生冷裂纹。()

Which of the following is NOT a compound word？

A. Pencilbox.
B. Unreasonable.
C. Deadline.
D. Upstairs.