【简答题】在6月5日“世界环境日”活动中,某兴趣小组对生产及生活污水进行了探究. (1)第一小组同学在学校附近的家化工厂调查,发现该厂在生产过程中用到硫酸. [猜想]该工厂排放的废水呈酸性. [设计实验] 实验操作 实验现象 实验结论 ______ ______ 该废水呈酸性 [建议与反思]为防止造成水污染,同学们联合向厂家建议,应将废水治理达标后再排放,你认为治理该酸性废水时适宜加入的试剂是______(...
【单选题】Woman: The clerk said that we had to wait until after lunch to pick up the papers. Man: But what are we going to do to kill time before then? Question: What does the man mean?
A.
He doesn't have anything to do.
B.
He believes she is wrong about the pick-up time.
C.
Before lunch is a great time to pick up the document.
D.
Time passes very quickly.
【单选题】When the woman saw that her son was OK after the car accident, she said , “Well, dear, you are the most important for me, not the expensive car.”
【单选题】对5S和其它活动的关系,下列表述正确的一项是:()
【单选题】酶竞争性抑制作用的特点是
A.
k\r\n m \r\n值不变,V\r\n max \r\n降低
B.
k\r\n m \r\n值降低,V\r\n max \r\n不变
C.
k\r\n m \r\n值增高,V\r\n max \r\n不变
D.
k\r\n m \r\n值不变,V\r\n max \r\n增加
E.
k\r\n m \r\n值降低,V\r\n max \r\n降低
【简答题】以下关于《茶经》内容的阐述,哪些是正确的( )
【单选题】When the woman saw that her son was OK after the car accident, she said _____, “Well, dear, you are the most important for me, not the expensive car. ”
【判断题】The woman who did not attend the meeting said that she had to study for her chemistry exam. This sentence is correctly punctuated.