在各省(市)公司所属地市分公司及部分加油站承办的业务有()。
A.设立发卡充值点
B.承办加油卡的发放
C.承办加油卡的充值
D.开具发票业务
参考答案:A, B, C, D
Both the family and the society ________ exceptional children live are often the key to their growth
and development. [ ]
A. which
B. what
C. in which
D. that
U型管换热器内流体流量不变,管子的传热面积相同,则U型管换热器的管内流体流速可较单程换热器提高()倍。
A、1
B、2
C、3
D、4