在中国与俄国的贸易中,中国始终处在顺差的地位。
参考答案:错
Auer小体不见于 ()
A.M1型白血病
B.M3型白血病
C.急性淋巴细胞白血病
D.急性单核细胞白血病
E.M2型白血病
Every device () in the spacecraft must be designed and made with great care so as to be sure that nothing goes wrong in operation.
A. to be fitted
B. fitted
C. fitting
D. to have been fitted