多项选择题
虚约束在实际机构中是存在的，加入虚约束的目的包括：________。
- A．使机构受力均衡
B．增加构件的刚度
C．提高运动的可靠性
D．使机构结构更加美观
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捕手传杀三垒时，接______球的步法：接住球后，右脚用后交叉垫步向三垒伸踏。（填写“左边”、“正中”或“右边”，不需要加双引号） -
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Recently, the events of bomb exploding were often happened in the areas of the worlD.Meanwhile, two bombs exploded in Algeria Tuesday as a European Union team met with government leaders to discuss the wave of civilian massacres.One bomb went off at a bus center in the center of the capital of Algiers, killing one person, and an hour later, another bomb blew up in the coastal town of Annaba, killing 3 others. The Algerians agreed to allow EU deputy foreign ministers in to discuss the situation but again, turned down any UN investigation.What happened in Algeria Tuesday?A.A bomb explosion.B.Murder.C.Massacres.D.A civil war.
A.B.
What
C.A
D.
B.Murder.
C.Massacres.
D.A
