《雾都孤儿》中,下面哪些设施或服务是当时的伦敦还没有出现的?
A. 公共交通马车
B. 生鲜超市
C. 邮局
D. 银行
复位后执行PUSH 00H,是把: 。
A. R0的值压入08单元
B. 00H压入07H单元
C. 00H位压入堆栈顶部
D. 00H压入06H单元
He made wild ______ about being able to cure cancer.
A. assertions
B. claims
C. declarations
D. statements
Which of the following elements is necessary for biological nitrogen fixation?
A. Copper
B. Zinc
C. Manganese
D. Molybdenum