大巷的主要任务是什么？（） ["运输","通风","排水","敷设管线"]
课堂中应用接受学习和发现学习的指导原则是（）。 ["综合性原则","以意义学习的理论为指导","在两种方式相互为用中，要分清主辅","在具体实施中要灵活机动"]
利用自动系统、信息技术或其他有形要素来完成服务过程的服务，如自动取款等被称为（） ["高接触性服务","高技术性服务","连续性服务","间断性服务"]
Examine the structure of the EMPLOYEES table: Column name Data type Remarks EMPLOYEE_ID NUMBER NOT NULL, Primary Key EMP_NAME VARCHAR2(30) JOB_ID VARCHAR2(20) NOT NULL SAL NUMBER MGR_ID NUMBER References EMPLOYEE_ID column DEPARTMENT_ID NUMBER Foreign key to DEPARTMENT_ID column of the DEPARTMENTS table You need to create a view called EMP_VU that allows the users to insert rows through the view. Which SQL statement, when used to create the EMP_VU view, allows the users to insert rows?（） ["CREATE VIEW emp_vu AS SELECT employee_id, emp_name, department_id FROM employees WHERE mgr_id IN (102, 120);","CREATE VIEW emp_vu AS SELECT employee_id, emp_name, job_id, department_id FROM employees WHERE mgr_id IN (102, 120);","CREATE VIEW emp_vu AS SELECT department_id, SUM(sal) TOTALSAL FROM employees WHERE mgr_id IN (102, 120) GROUP BY department_id;","CREATE VIEW emp_vu AS SELECT employee_id, emp_name, job_id, DISTINCT department_id FROM employee"]
李先生，腹部被车撞伤5h，腹痛明显，伴面色苍白，四肢厥冷，体检：血压75/55mmHg，脉率140/min，全腹轻度压痛、反跳痛、肌紧张，腹部透视无异常发现。腹腔穿刺抽出不凝血液。 该患者腹腔穿刺液中血液不凝固的原因是（） ["凝血因子消耗","出血量过大","凝血功能障碍","腹膜有脱纤维作用","误穿人血管"]
ISO2631用（）值给出中心频率在（）赫兹人体对振动反应的三种感觉界限。
