喷射混凝土的主要工艺参数有哪些？
参考答案：
1工作风压
2水压
3水灰比
4喷头与受喷面的距离和倾角
5一次喷射厚度
Which of the following best describes a Treasury note Pays:（）
A. implicit interest; is non-callable; has a 2- to 10-year maturity.
B. explicit interest; is callable; has a 1- to 15-year maturity.
C. explicit interest; is non-callable; has a 2- to 10-year maturity.
公债没有风险。( )
