A refrigerant with oil in solution has a ().
A. higher boiling temperature for a given pressure than does a pure refrigerant
B. lower boiling temperature for a given pressure than does a pure refrigerant
C. boiling pressure equal to that of a pure refrigerant at a given pressure
D. boiling point will not be affected by entrained oil
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下列哪种花卉是蔓性的草本花卉?()
A. 常春藤
B. 紫藤
C. 花叶蔓长春花
D. 茑萝
最古老而又最常用的教学方法是()。
A. 发现教学法
B. 案例教学法
C. 讲授法
D. 对话法