在铝合金编号中，T4的含义是（）

[单选题]在2024-T3铝合金编号中，T3的含义是（）A . 固溶处理、冷作硬化和自然时效B . 固溶处理和自然时效C . 固溶处理和人工时效D . 退火

[单选题]在7075-T6铝合金编号中，T6的含义是（）（T—热处理过程）A . 固溶处理和冷作硬化B . 固溶处理和自然时效（T4）C . 固溶处理和人工时效D . 退火（0）

[单选题]在2024一T3的铝合金的编号中T3的含义是什么（）。A . 固溶处理、冷作硬化和自然时效B . 固溶处理、冷作硬化和人工时效C . 是平衡加油枪与加油口盖二者之间的电位差D . 固溶处理和人工时效

[填空题] 在铝合金2024-O，编号中字母O的含义是：（）.

[单选题]下列铝合金中（）是硬铝合金。A . LF5B . LY11C . LD5D . ZL201

[单选题]7075-T6铝合金是（）。A .经过固溶热处理和人工时效的铝锌合金。B .经过固溶热处理和人工时效的铝铜合金。C .仅作人工时效处理的铝锌合金。D . D.仅作人工时效处理的铝铜合金。

[单选题](T4)A． DEPENDSB．ESSENTIALC．DISCOURAGED A.THE CHILD GETS(T1)______B．THIS(T2)______ON INTERACTIONC．IS(T3)______TO THE GROWTH BUT SPEECH HAS TO BE INDUCED, AND(T4)______BETWEEN THE MOTHER AND THE CHILD,WHERE THE MOTHER RECOGNIZES THE SIGNALS IN THE CHIL

[单选题](T4)A．SEEKB．LOOKEDC．PART A.TAKING(T1)______IN DANGEROUS SPORTS AND ACTIVITIESB．WHO HAVE(T2)______FOR ADVENTUREC．WHO(T3)______AN IMMEDIATE EXCITEMENT FROM A RISKY ACTIVITY AROUND THE WORLD MORE AND MORE PEOPLE ARE(T4)______.OF COURSE, THERE HAVE ALWAY

[单选题](T4)A．HANDLEB．ONC．CONTINUED TO A.THE TREND WAS NATURALLY MOST OBVIOUS IN THOSE AREAS OF SCIENCE BASED ESPECIALLY(T1)______A MATHEMATICAL OR LABORATORY TRAININGB．AMATEURS, ON THE OTHER HAND, HAVE(T2)______PURSUE LOCAL STUDIESC．ONE MAN COULD CONTINUE T

[单选题](T4)A．OUTB．GO FORC．BUT FOR A.NOT FOR OUR NEEDS, MIND YOU,(T1)______OUR DEMANDSB．IF YOU(T2)______A MASTER"S DEGREEC．YOU CAN SUCCESSFULLY DROP(T3)______IN GRADE SCHOOL GET A HIGH SCHOOL DIPLOMA, AT LEAST WITHOUT THAT, YOU ARE OCCUPATIONALLY DEAD, UNLE