以下选项中()属于同时凝固原则的优点。
A.各部分冷却均匀
B.铸件不容易产生变形和裂纹
C.冒口补缩作用好,铸件内部致密
D.热应力小
参考答案:A, B, D
The mountain climbers had to return , as their food and water are________.
[ ]
A. run out of
B. run out
C. given out
D. using up
下列疾病中哪些不发生感染性休克()
A.革兰阴性杆菌败血症
B.大叶性肺炎
C.暴发性流脑
D.霍乱
E.细菌性痢疾