第27题:[单选题]( )S1: What is your port of registry? S2:My port of registry is Guangzhou. Q:What is asked about? A.Port of destination B.Port of registry C.Port of departure D.Port of calls 参考答案:B
第36题: [单项选择]已知微分方程y′+p(x)y=q(x)[q(x)≠0]有两个不同的特解y1(x),y2(x),C为任意常数,则该微分方程的通解是()。 A. y=C(y1-y2) B. y=C(y1+y2) C. y=y1+C(y1+y2) D. y=y1+C(y1-y2) 参考答案:D 答案解析: