(判断题)25: 两个无穷小量的商仍是无穷小量。 A: 对 B: 错 ...

(多选题)19: 下列关于无穷小量叙述正确的是（ ）。 A: 无穷小量是一个很小的数 B: 无穷小量是0 C: 无穷小量是以0为极限的变量 D: 有限个无穷小量的代数和是无穷小量 ...

(多选题)13: 下列结论错误的是（ ） A: dy/dx=2x是一阶微分方程 B: y'+y^2=x是二阶微分方程 C: dy/dx=e^(x+y)不是变量可分离方程 D: dy/dx-siny=x是一阶线性微分方程 ...

(单选题)7: 下列函数在点x=0处连续但不可导的是( )。 A: 1/x B: |x| C: x^2 D: lnx ...

(单选题)1: 设x和y分别是同一变化中的两个无穷大量，则x-y是（ ）。 A: 无穷大量 B: 无穷小量 C: 常数 D: 不能确定 ...

(单选题)20: He is a doctor, so ( ). A: he does wife B: is his wife C: his wife is ...

(单选题)14: He came here a year ( ), and I have been here ( ) two years. A: ago, for B: before, in C: before, for ...

(单选题)8: He went on with his work ( ) the difficulties. A: in spite of B: although C: out of spite ...

(单选题)2: We worked all day, ( ) we didn't finish it. A: also B: or C: but ...

(单选题)21: He looks tired, he ( ) too little sleep. A: must have B: must have had C: must have been ...