气体灭火系统的（）不允许无关人员进入。 A.容器的储存区域 B.容器的运输通道 C.

下图表示将叶片制成切片，并在显微镜下观察到叶片结构的情况。据图回答问题：（5分）

（1）①是叶片中的        ，具有输导水、无机盐和有机物的功能。

（2）②是        ，其细胞里含有较少的叶绿体。

（3）③     是叶片与外界进行气体交换的门户，它的开闭由两个肾形的      控制。

（4）成熟的植物细胞具有④              。

女式边沿层次修剪导线时，左手夹住的发片应紧贴头皮，并保持（）。

A.零度

B.高度

C.低度

D.平衡度

斜面也是一种简单机械。如图所示，已知斜面上木箱的质量m=40kg，人对木箱的拉力F=75 N，斜面长s=4 m，斜面高h=0.5 m。求：

①木箱受到的重力（g取10 N／kg）；

②斜面的机械效率。

列检作业发现车辆标签丢失、破损失效或未安装标签的车辆（铁道部指示不安装标签的车辆除外）（）。

A、及时扣修

B、放行

C、就地安装

D、随意处理

According to historical records，the first (1) Olympic Games can be traced back to 776 BC.They (2) dedicated to the Olympian gods and were staged on the (3) plains of Olympia.They continued for nearly 12 centuries， (4) Emperor Theodosius decreed in 393 A.D.that aU such"pagan cults" (5) banned.
The oldest myth which concerns the beginning of the (6) Games is that of Idaios Daktylos Herakles.According to other (7) ，Zeus，the father of humanity，fought and defeated Cronus in a (8) for the throne of the gods.Finally，the well-known (9) Herakles is mentioned who staged games in Olympia in honour (10) Zeus,because the latter had helped him conquer Elis when (11) went to war against Augeas.
Through the 12 centuries of (12) Olympic Games，many wonderful athletes competed in the stadium and (13) hippodrome of ancient Olympia’s sacred area，moving the crowds with (14) great achievements.Although mortal，their Olympic victories immortalised them.Of (15) best athletes who left their mark on the sacred vallev (16) Olympia，some surpassed all limits and became legends by winning (17) successive Olympic Games and remaining at the forefront of their (18) for more than a decade.
The ancient Olympic Games were (19) a one.day event until 684 BC.when they were extended (20) three days.In the 5th century B.C.，the Games were extended again to cover five days.