选择题。一杯糖水50克,含糖5克,这杯糖水的含糖率是()。A,5÷ 50* 100\�B,50\div 5\times 100\�C,$5\div \left ( {50
得数比50小的算式有( ). A: 90-6\times3 B: 66+35\div7 C: 20\div5+21 D: 100-81\div9 相关知识点: 试题来源: 解析C 正确率: 0% A 选项: 90-6\times3=90-18=72;72>50,即这道题的结果大于50,故\text{A}错误; B 选项:
种子涂抹干燥无菌滤纸上,撒在瓶含 50 毫升的 MS 培养基中含有 3%蔗糖 (村蕃、 斯库格 1962年)。介质的 ph 值调整到与之前的 0.25%培养基 (西格玛) 加入 1 N KOH 5.8 和蒸压 20 分钟 121 ° c 种子萌发温度为 25 ± 1 ° C,16 h 光照 (辐照度 100 内源性 m−2 s−1)。下胚轴和 翻译...
about running and has completed over 100 marathons (马拉松)so far. More people(2) C to take it easy after they retire (退休),but Wang Guilan,from Liaoning,is certainly not one of them.She only started running at the age of 50,as a(3) Dto keep in shape....
( ) 5. Which sentence is NOT true? A. 90% students do homework every day. B. 50% students eat junk food three or four times a week. C. All students do homework every day. D. Only 5% students exercise once a week. . 答案 答案: 1.A;2.B;3.D...
词汇与语法知识(50分)从每小题的四个选项中,选出最佳的一项,并把它前面的大写字母填入左面的括号里。( ) 6. I feel it an honour to, speak here. A. to ask B. to be asked C. asking D. having asked( ) 7. for several times, Bill made up his mind not to watch lat...