为减少高厚比,满足墙稳定性要求,可采取的措施有 I.减少横墙间距; II.降低层高;Ⅲ.加大砌体厚度; Ⅳ.提高砂浆强度等级; V.减少洞口尺寸; VI.减少荷载;Ⅶ .提高块体强度。以下何者为正确: () 。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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