问题
单项选择题
Diesel powered industrial trucks on a ship that are provided with safeguards to the exhaust，fuel，and electrical systems are designated（）.
A.DEFE
B.DE
C.DS
D.DES
答案
参考答案：C
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Diesel powered industrial trucks on a ship that are provided with safeguards to the exhaust，fuel，and electrical systems are designated（）.
A.DEFE
B.DE
C.DS
D.DES
参考答案：C
，氮原子的相对原子质量为14。则(不需要写计算过程)：
kg，求铝原子的相对原子质量________________ (结果保留整数)。