燃气储备站的()工艺流程按燃气的储存压力分类,一般可分为高压储备站工艺流程和低压储备站工艺流程两大类。
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特殊情况下无《辐射安全许可证》可订购放射性核素及其标记化合物。
A. 正确
B. 错误
Since heat will not flow freely from a body at a () temperature to another at a () temperature, it is necessary to expend mechanical work, heat, or electrical energy from an external source to achieve refrigeration.
A. lower;higher
B. shallower;deeper
C. larger;smaller
D. higher;lower