属于神经毒素的有______。
A．葡萄球菌肠毒素
B．河豚毒素
C．肉毒毒素
D．沙门菌内毒素
E．副溶血性弧菌溶血毒素
参考答案：B,C
速度是表示______的物理量，它的国际主单位是______（填单位名称和符号）
After extinguishing a paint locker fire using the fixed CO2 system，the next action is to have the space（）.
A.opened and burned material removed
B.left closed with vents off until all boundaries are cool
C.checked for oxygen content
D.doused with water to prevent reflash
