由于煤层较松软，为达到光面爆破的要求，布置周边眼时要考虑巷道顶、帮由于爆破作用而产生的________。

A.耐热、电绝缘
B.耐化学腐蚀
C.能黏结金属和非金属
D.能黏结塑料

A．Alex prefers to stay indoors, because he feels discomfort.
B．Alex prefers to stay indoors, because he wants to read novels.
C．His eyes hurt, because it is heavily polluted in Beijing.
D．Alex has a sore throat.

A.10m
B.12m
C.15m
D.18m