在蒸汽冷凝传热中，不凝气体对其冷凝传热系数α的影响是（）。
A、使α降低
B、使α升高
C、对α无影响
D、无法判定
参考答案：A
根据常识，判断下列句子对(√)错(×)。
( ) 1. There are six days in a week.
( ) 2. Sunday is the first day of a week.
( ) 3. We often go to school from Monday to Friday.
( ) 4. Mother's Day is the third Sunday in June.
( ) 5. Today is Sunday. Tomorrow is Saturday.
工程上常用的路测系统和分析处理工具有（）。
