跨流域调水,应当怎样防止对生态环境造成破坏?
参考答案:
跨流域调水,应当进行全面规划和科学论证,统筹兼顾调出和调入流域的用水需要,防止对生态环境造成破坏。
—I hear a traffic accident happened yesterday. Was it terrible ?
—Yes. A car _____ and all the people in it were badly hurt. But luckily, none of them was killed. [ ]
A. fell over
B. fell behind
C. fell off
D. fell down to
下列说法正确的是
A.需要加热才能发生的反应一定是吸热反应
B.放热反应的反应物的总能量之和小于生成物的总能量之和
C.同一化学反应,若反应条件不同,限度可能不同
D.催化剂不但能改变反应速率,也能改变反应进行的限度