（）都不是由空间因素造成的古代书面语言的障碍。A、音读的变化 B、方言的分歧 C、错简D

常温下，在下列溶液中发生如下反应

①16H⁺+10Z^-+2XO₄^-→2X²⁺+5Z₂+8H₂O    ②2A²⁺ +B₂→2A³⁺+2B^-  

③2B^-+Z₂→B₂+2Z^-

由此判断下列说法错误的是（  ）

A．反应Z₂+2A²⁺＝2A³⁺+2Z^-可以进行。

B．还原性由强到弱的顺序是A²⁺、B-、Z^-、X²⁺

C．氧化性由强到弱的顺序是XO₄^-、Z₂、B₂、A³⁺

D．Z元素在①③反应中均被还原

解释着火温度。

下列程序的输出结果是
main()
double d=3.2；int x，y；
x=1.2；y=(x+3.8)/5.0；
printf("%d\n"，d*y)；

A) 3
B) 3.2
C) 0
D) 3.07

A volcanic eruption in Iceland has sent ash across northern Europe. Airlines have stopped or changed the flights across the Atlantic Ocean, leaving hundreds of passengers stuck in airports.
Grimsvotn is one of the largest active volcanoes in Europe. What makes Grimsvotn different is that it lies under a huge glacier(冰川) of ice up to 12 meters thick. The hot volcano heats up the ice above it, which then forms a layer(M) of water between the glacier and the volcano. This layer of water puts pressure on the volcano ,keeping it stable. As the water flows out from under the glacier, the pressure Rifts. The lava(岩浆) from the volcano then comes up to the surface. This is exactly what has happened today.
Now, airlines have to make changes to their flights so as not to fly through the clouds of volcanic ash. According to KLM, one of Europe’s biggest airlines, airplanes cannot go under the cloud or over it. Going through the cloud can result in ash getting stuck in the airplane’s engines, causing damage to the plane.
The eruption has also caused problems for animals in Iceland. The volcano left ash and sharp, glass-like rocks all over the countryside. Farmers are keeping their animals inside to stop them from eating ash-covered grass or the sharp objects.

What makes Grimsvotn different from other volcanoes

A．It is below ice.

B．It lies under the sea.

C．It is the largest volcano.

D．Its lava affects the airlines.

救生艇的冷却水冬季应（）。

A.加符合标准的防冻液

B.电暖器通电保持温度

C.可以随时启动随时加水