水泥混凝土路面脱皮露骨、出现空洞,主要是由以下因素影响的?
参考答案:
⑴材质问题。碎石、砂中含泥量过大,或有泥块,通车后出现坑洞,或表面砂浆强度不够,出现脱皮露骨。
It's true that the old road is less direct and a bit longer. We won't take the new one, ______, because
we don't feel as safe on it. [ ]
A. though
B. therefore
C. too
D. while
引用两项以上权利要求的多项从属权利要求,只能以择一方式引用在前的权利要求,但能作为另一项多项从属权利要求的基础。