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【多选题】
Which of the following statements about the relationships between exposure routes of nanoparticles and their health risks are correct?A.
Exposures to nanomaterials may occur through inhalation, dermal contact, accidental injection, & ingestion, the risk increases with duration of exposure & the concentrations of nanoparticles in the sample or air.
B.
Inhalation presents the lowest exposure hazard.
C.
Nanomaterials suspended in a solution or slurry pose a lesser hazard, however, sonication, shaking, stirring, pouring, or spraying can result in inhalation exposure.
D.
Nanoparticles that are fixed within a matrix pose the least hazard as long as no mechanical disruption, such as grinding, cutting, or burning, occurs.
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举一反三
【单选题】在结束一条直线的绘制后,直接按两次回车,将会()。
A.
中断直线命令
B.
以刚结束绘制直线的末端为起点开始直线的绘制
C.
以圆弧为起点绘制直线
D.
以圆心为起点绘制直线
【简答题】结束直线绘制我们可以按“ESC”键或“（ ）”键。A. enter