多项选择题

What are the main points of the speech?

A．Technology hasn't made it easier to connect with each other.
B．This problem can be worked out by five ways.
C．The reasons that caused this problem.

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单项选择题

对于有免疫缺陷或有免疫抑制患者输血，最好应输注以下哪种血液制品（）
A、悬浮红细胞
B、洗涤红细胞
C、辐照红细胞
D、去白细胞红细胞

不定项选择

SC represents the maximum concentration of a potential toxicant that is harmless to organisms after long-term exposure of at least one generation.

A．正确
B．错误