下列化合物与重氮盐发生耦合反应时，反应取向正确的是（    ）
A、
B、
C、
D、

单项选择题驻波中，任意两个振动质元的相位差或者为0，或者为。 A、正确 B、错误

单项选择题Before any month-end adjustments are made, the net income of ABC company is 12,000 rental at the beginning of the year for a whole year. After adjusting entries are made for the items listed above, ABC companys net income is ____ A、0. C、$124,000. D、None of the above.