支持心房扑动折返机制的证据是（）。 A.心房刺激可以诱发和终止 B.可以被超速起搏拖

After its (1) to the (2) in 2001, China has taken steps towards opening up its (3) . As a condition for joining the WTO, China (4) itself to a (5) of trade liberalization, including the reduction of tariffs on cars and agricultural products. These tariffs reductions are both (6) and there is (7) for China to (8) at a faster pace.
A (9) of (10) and a more rapid and profound reduction of import tariffs would (11) of those Chinese consumers who would (12) imported products at lower prices. Second, a higher (13) into China would take away much upward pressure on the Renminbi and provide a true and lasting (14) to solving current global (15) . Indeed, even a modest (16) in the opening-up process would go a long way towards solving the problem.
The opening up of China’s markets to international competition should (17) deep reforms. Banks should be recapitalized, bad loans provisioned fully and state-owned companies’ runaway indebtedness (18) . Only when real progress in these areas is made should China begin to consider a reform to its (19) . Doing it any earlier would be highly (20) .

一辆汽车沿平直公路从甲站开往乙站，启动加速度为2 m/s²，加速行驶5 s后匀速行驶2 min，然后刹车，滑行50 m，正好到达乙站，求汽车从甲站到乙站的平均速度为多少？

填写下列名言名句。

（1）外无期功强近之亲，内无应门五尺之童。______________，______________。

（2）既自以心为形役，奚惆怅而独悲！______________，______________。

（3）______________，风飘飘而吹衣。问征夫以前路，______________。

（4）时维九月，序属三秋。______________，______________。

（5）______________，______________。渔舟唱晚，响穷彭蠡之滨；雁阵惊寒，声断衡阳之浦。

工程项目实地尺度测量的内容主要包括（）等。

放大摄影允许的模糊阈值是

A．0.1mm
B．0.2mm
C．0.5mm
D．1.0mm
E．2.0mm