在298K时,反应 2H2O2=2H2O+O2,未加催化剂前活化能Ea=71 kJ·mol-1,加入Fe3+作催化剂后,活化能降到42 kJ·mol-1,加入催化剂后反应速率为原来的( )。 A.
29倍 B.
1×103倍 C.
1.2×105倍 D.
5×102倍

企业5月份发生销售费用50万元，月末应结平“销售费用”账户，则“销售费用”账户（　）万元。 A、月末借方余额5...

单项选择题企业5月份发生销售费用50万元，月末应结平“销售费用”账户，则“销售费用”账户（　）万元。
A、月末借方余额50
B、月末贷方余额50
C、本期贷方发生额50
D、以上都不对

A. 对 ...

单项选择题 A. 对 B. 错

Which of the following represent problems encountered w...

多项选择题Which of the following represent problems encountered when comparing the financial statements of two separate entities? ( ) A. Either one, or both, of the firms may be conglomerates and thus have unrelated lines of business. B. The operations of the two firms may vary geographically. C. The firms may use differing accounting methods. D. The two firms may be seasonal in nature and have different fiscal year ends.