题目

阅读理解 Crossing your legs is an extremely common habit. While you mayfind it comfortable to sit with one knee crossed over the other, it might be causinghealth problems that you are not aware of. A study published in Blood Pressure Monitoring stated that sittingwith your legs crossed can increase your blood pressure. The reason is that crossingone leg over the other increases resistance, making it even harder for the bloodto circulate and increase your blood pressure. Thus, you shouldn't have your legscrossed for more than 15 minutes, and it's important that you get up and walk aroundat 某同学用已调节好的托盘天平测量物体的质量，操作如图所示，其中错误的是：（1）______．（2）______．