如果焊缝尺寸与要求不符，下列说法中不正确的是（）。
A、易形成应力集中
B、降低接头强度
C、影响结构的安全使用
D、减小焊接变形
参考答案：D
David Landau, CFA, was discussing the biases associated with the Consumer Price Index (CPI). He was also discussing the effect of these biases on determining the inflation rate of an economy. Which of the following is least likely a source of bias in CPI data and does the CPI generally understate or overstate the true rate of inflationNot a source of biasCPI bias direction（）
A. Outlet substitution Overstate
B. Quality changes Understate
C. Consumer preferences Overstate
对于旅游者计划外合法的娱乐要求，导游人员正确做法是（）。
A.提供力所能及的帮助
B.为旅游者订票
C.帮助他们搭车
D.安全提示
