[多项选择]下列关于我国现行工程变更价款的确定，说明正确的有( )。
A. 合同中没有适用或类似于变更工程的价格，由承包商提出适当的变更价格，经总监理工程师确认后执行
B. 工程变更价款需经造价工程师确定后执行
C. 合同中已有适用于变更工程的价格，按合同已有的价格变更合同价款
D. 合同中只有类似于变更工程的价格，可以参照类似价格变更合同价款
E. 业主和承包商未能就工程变更价款等方面达成协议时，项目监理机构应提出一个暂定价格，作为临时支付工程款的依据

"I’ve been shot in the leg. I’ve been beat up. But that’s pretty minor," says a 41, year-old American security contractor who spent four years in Iraq. "But when you get a vehicle blown out from under you, it does tend to affect one a little bit."
With a broken back, two broken feet and neurological(神经的) damage, the man, who asked that his name not be used, spent the next three months in hospitals in Iraq,, Germany and America. But though he was physically on the mend by the start of this year, he found himself incapable. "I was having nightmares," he recalls. "I couldn’t do anything. Mostly, I’d just stay in a room and not leave."
Post Traumatic Stress Disorder (外伤后压性疾病), or PTSD, is the lasting of declining psychological symptoms. It can include flashbacks and nightmares, increased arousal in the form of insomnia(失眠), anger and an inability to concentrate, and impaired personal relationships. Although lasting psychological damage from