What is one reason Canadians began to immigrate to Maine during the 1800s?
A.Maine was less influenced by the French government.
B.Maine had better employment opportunities.
C.Maine was politically stable.
D.Marine had a better climate.
第8题
下列属于煤矿使用炸药要求的是()。
A.炸药的爆热、爆温、爆压都要高一些
B.炸药的起爆感度低,以保证安全爆破
C.炸药的爆速要高
D.炸药配比应接近零氧平衡
第10题
A.炸药在爆炸时放出的热量称为爆热
B.单位质量炸药爆炸时放出的热量称为爆热
C.单位质量炸药在定容条件下爆炸时放出的热量称为爆热
D.定容条件下炸药在爆炸时放出的热量称为爆热
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