They may be _____ to err on the side of caution.

异常抛出语句(异常错误警示、异常提取语句)总是要与条件语句if以及异常处理语句try联合使用的,其他使用格式大致为: A: try:...if条件:raiseException（异常信息）breakexceptExceptionaserr:print(err) B: try:...if条件:raiseException（异常信息）breakexceptException(异常信息):print(err) C: try:...if条件:raiseexceptbreakexceptExceptionaserr:print(err) D: try:...raiseException（异常信息）exceptExceptionaserr:print(err)

JJ A: hj B: df C: j D: i E: err

​读取目录的语法格式：fs.readdir(path, callback)，参数callback - 回调函数，回调函数带有两个参数err, files，err 为错误信息，files 为 目录下的文件数组列表。​

‌读取目录的语法格式：fs.readdir(path, callback)，参数callback - 回调函数，回调函数带有两个参数err, files，err 为错误信息，files 为 目录下的文件数组列表。‍

Two systems of weights and measures used in the U.S. are ______. A: the U. S. Customary System and the metric system B: the International System and the metric system C: the Imperial System and the metric system D: the Customary System and the Imperial system

Starting system and ignition system belong to the electrical system？

Java系统的标准输入对象是System.in,标准输出对象有两个,分别是标准输出System.out和System.err。

What does the autopilot system include?? Hydraulic system|Mechanical system|Electrical system|All of above

The Atlantic Ocean is ( ). A: a closed system B: an open system C: an isolated system D: a homogeneous system