—What'stheyoungman?
—______.
A、Heisfriendly
B、He'sateacher
C、He'sfine
D、He'sTom
Johnsaidhewouldpay__________secondvisittoChina__________nextmonth.
A、the;/
B、the;the
C、a;the
D、a;/
设3元非齐次线性方程组Ax=b有解α1，且r(A)=2，则Ax=b的通解是
_____seen,itwillneverbeforgotten.
A、Once
B、After
C、Though
D、Unless
A、综合保险
B、统保保险
C、出口买方信贷保险
D、买方违约保险